A DOMString object containing a human-readable string which provides specific diagnostic information to help the reader understand the error condition which occurred; specifically, it isn't simply a summary of what the error code means, but actual diagnostic information to help in understanding what exactly went wrong. This text and its format is not defined by the specification and will vary from one user agent to another. If no diagnostics are available, or no explanation can be provided, this value is an empty string ("").

Methods

This interface doesn't implement or inherit any methods, and has none of its own.

[1] While the message property was introduced in Firefox 51, it was only included in nightly builds since it was not part of the specification at that time. As of Firefox 52, it's now available in all builds, including release, since it's now part of the HTML DOM specification.